Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Cyrillic letter Straight U ( , ) (in Mongolian, Kazakh, Kyrgyz, Tatar, Bashkir languages, Buryat and Kalmyk languages and many others) is a form of the Cyrillic letter with a straight, rather than diagonal, center line. It is used to represent the close front rounded vowel /y/. Though the letter resembles the Latin letter Y in its uppercase form, the two should not be confused.